_:n512b570b4d704bcf99e43e6bcd4c8b2dxb1
<http://schema.org/isAccessibleForFree>
"true"^^<http://www.w3.org/2001/XMLSchema#boolean>
<https://bmcbioinformatics.biomedcentral.com/articles/10.1186/s12859-015-0567-3/figures/9>